Molding apparatus



F. B. DAVIS.

MOLDING APPARATUS.

APPLICATION FILED AuG.1. 1919.

Suva/Wto;

anormal PATENT OFFICE.

FRANK BROUGHTON DAVIS, F ERIE, PENNSYLVANIA.

HOLDING APPARATUS.

Application filed August 1, 1919.

To @ZZ whom t may concern:

Be it known that I, Fir-mii B. Davis, a citizen et the United States,residing at Erie, in the county of Erie and State of l."enns 1,lvania7have invented new and useful Improvements in a Molding Apparatus, ofwhich the following -is a specification.

rhe invention is designed particularly for use by dentists in castinginlays.

The drawing shows a central vertical section through the apparatus.

' 1 marks a mold holder having a seating surface 1a on its upper edge7 2a molding composition, 8 a mold and l the opening to the mold. The moldis ot the ordinary form and the manner of preparing it is well known.

It is desirable to force the metal into the mold with pressure. Themetal is ordinarily melted at the opening fl with a blow pipe. To obtaingood results the pressure must be applied before the metal entering themold cools to any great extent. lVith my apparatus this is simply andconveniently done.

A seating plate 5 has the aring flange 6 extending therefrom forming acupshaped seating device that can be instantly put in place on theholder 1. A gasket 7 is secured to the plate preferably by forming thegroove 8 at the base of the lange and forcing the gasket into it.

A projection 9 extends upwardly from the plate. An annular groove 10 isformed in the projection. The end 11 of a bulb 12 is secured in thegroove so as to make a tight joint capable of sustaining pressure. Theupper end 13 of the bulb is suitably secured in a groove 14 in a pushpin 15.

The push pin has a pointed end 16 seating in a socket 17 so that the pinmay swing relatively to the plate 5, The pin has a handle 18 at itsupper end. Openings 19 extend through the plate 5 from the seatingsurface to the bulb.

In operation, the dentist having melted the metal grasps the bulb withone hand; places the plate on the mold; exerts pressure on the handle tohold the plate on the holder and to close the joint at the seatingsurface; and then squeezes the bulb compressing the contained air andforcing it into the mold. The apparatus is held in place until the metalbegins to set. The piv- Specification of Letters Patent.

Patented Aug. 16, 1921. semi No. 314,746.

otal mounting of the push pin permits it to swing slightly withoutdisturbing the joint.

It is desirable to limit the air pressure that may be exerted on themold. This is accomplished as follows :`Radial openings 2O are arrangedin the pin 15 and lead to an axial opening 21. The opening 21 leads to alarger opening 22. the shoulder at the bottom of the opening 22 forminga seat 23. A. valve 24 operates on the seat 23. The valve has a stem 25extending into a spring 2G. The spring holds the valve closed untilthere is an excess ot pressure on the lower face ot the valve. lVhenthis occurs the valve opens and the air passes out through an opening27. rIhe escaping air informs the operator of the condition and he canthen temper his grasp accordingly.

lllhat I claim as new is 1. In a molding apparatus, the combination of amold; a movable air compressor adapted to be moved and operatedmanually; and means carried by the compressor and movable therewith forconnecting the compressor with the mold.

2. In a molding apparatus, the combination of a mold; a movable andcollapsible air compressor adapted to be moved and operated manually;and means carried by the compressor and movable therewith for connectingthe compressor with the mold.

3. In a molding apparatus, the combination of a mold; a movablebulb-shaped collapsible air compressor adapted te be moved and operatedmanually by compressing the bulb within the hand ot the operator; andmeans carried by able therewith for sor with the mold.

, 4. In a molding apparatus, the combination of a mold; a movable andcollapsible air compressor adapted to De moved and operated manually;and means carried by the compressor and movable therewith for connectingthe compressor with the mold, said means comprising a seating deviceseating on the mold.

5. In a molding apparatus, the combination of a mold; a movable andcollapsible air compressor adapted to be moved and operated manually;means carried by the compressor and movable therewith for connecting thecompressor with the mold, said means comprising a seating device seatingconnecting the compresthe compressor and movon the mold; and meansextending through the compressor for exerting pressure on the device.

6. In a molding apparatus, the combination of a mold; a movable andcollapsible air compressor adapted to be moved and operated manually;means carried by the compressor' and movable therewith 'for connectingthe compressor with the mold, said means comprising a seating deviceseating on the mold; and means extending through the compressor forexerting pressure on the device andfhaving a Haring seating cup andgasket.

7. In a molding apparatus, the combination of a mold; a movableaircompressor adapted to be moved and operated manually; means carried bythe compressor and movable therewith for connecting the compresser withthe mold; and devices for limiting the pressure exerted by thecompressor.

8. In a molding apparatus, the combination of a mold; a movable aircompressor adapted to be moved'and operated manually; means carried bythe compressor and movable therewith for connecting the compressor Withthe mold; and devices for limiting the com rlsiner a relief valve ooeratin on a re C b determined pressure. Y

9. In a molding apparatus, the combination of a seating plate; acollapsible bulb attached to and movable with the plate, there being anopening from the plate to the bulb; and a push pin pivotally mounted onthe plate and extending through the bulb.

l0. In a molding apparatus, the combination of a seating plate; acollapsible bulb attached to and movable With the plate, there being anopening from the plate to the bulb; and a push pin pivotally mounted onthe plate and extending `through the bulb and containing a reliefvalve.v

l1. In a molding apparatus, the combination of a plate adapted to make aseat on a mold; a push pin for exerting pressure on the plate,y saidpush pin having a ball joint with the plate; and means for deliveringair under pressure through the plate.

In testimonyivhereoi' I have hereunto set my hand.

FRANK BRoUeHToN Davis.

